1 # RUN: llc %s -o - -mtriple=x86_64-unknown-unknown \
2 # RUN: -experimental-debug-variable-locations \
3 # RUN: -start-before=phi-node-elimination \
4 # RUN: -stop-after=register-coalescer \
5 # RUN: | FileCheck %s --check-prefix=DOESCOALESCE
6 # RUN: llc %s -o - -mtriple=x86_64-unknown-unknown \
7 # RUN: -experimental-debug-variable-locations \
8 # RUN: -start-before=phi-node-elimination \
9 # RUN: -stop-after=virtregrewriter \
10 # RUN: | FileCheck %s --check-prefix=CHECK
12 # This is a sibling-test for phi-coalescing.mir, using similar code but where
13 # registers are coalesced across subregisters. Specifically, vreg %2 below is
14 # a 16-bit register, but will be coalesced into the lower 16 bits of a 32 bit
15 # vreg during coalescing. We should survive this transformation, and emit a
16 # DBG_PHI for $bx where the PHI was.
18 ; ModuleID = 'promoted.ll'
19 source_filename = "test.c"
20 target datalayout = "e-m:e-p270:32:32-p271:32:32-p272:64:64-i64:64-f80:128-n8:16:32:64-S128"
21 target triple = "x86_64-unknown-linux-gnu"
23 ; Function Attrs: noinline nounwind uwtable
24 define dso_local i32 @foo(i16 signext %bar, i16 signext %baz) !dbg !7 {
26 call void @llvm.dbg.value(metadata i16 %bar, metadata !12, metadata !DIExpression()), !dbg !13
27 call void @llvm.dbg.value(metadata i16 %baz, metadata !14, metadata !DIExpression()), !dbg !13
28 call void @ext(i16 signext %bar), !dbg !13
29 %conv = sext i16 %bar to i32, !dbg !13
30 %add = add nsw i32 %conv, 12, !dbg !13
31 %conv1 = trunc i32 %add to i16, !dbg !13
32 call void @llvm.dbg.value(metadata i16 %conv1, metadata !12, metadata !DIExpression()), !dbg !13
33 call void @ext(i16 signext %conv1), !dbg !13
34 %call = call signext i16 @getlong(), !dbg !13
35 %tobool = icmp ne i16 %call, 0, !dbg !13
36 br i1 %tobool, label %if.then, label %if.end, !dbg !13
38 if.then: ; preds = %entry
39 %conv2 = sext i16 %conv1 to i32, !dbg !13
40 %add3 = add nsw i32 %conv2, 1, !dbg !13
41 %conv4 = trunc i32 %add3 to i16, !dbg !13
42 call void @llvm.dbg.value(metadata i16 %conv4, metadata !12, metadata !DIExpression()), !dbg !13
43 br label %if.end, !dbg !13
45 if.end: ; preds = %if.then, %entry
46 %bar.addr.0 = phi i16 [ %conv4, %if.then ], [ %conv1, %entry ], !dbg !13
47 call void @llvm.dbg.value(metadata i16 %bar.addr.0, metadata !12, metadata !DIExpression()), !dbg !13
48 %conv5 = sext i16 %baz to i32, !dbg !13
49 %conv6 = sext i16 %bar.addr.0 to i32, !dbg !13
50 %add7 = add nsw i32 %conv6, %conv5, !dbg !13
51 %conv8 = trunc i32 %add7 to i16, !dbg !13
52 call void @llvm.dbg.value(metadata i16 %conv8, metadata !12, metadata !DIExpression()), !dbg !13
53 call void @ext(i16 signext %conv8), !dbg !13
54 %conv9 = sext i16 %conv8 to i32, !dbg !13
55 ret i32 %conv9, !dbg !13
58 ; Function Attrs: nounwind readnone speculatable willreturn
59 declare void @llvm.dbg.declare(metadata, metadata, metadata)
61 declare dso_local void @ext(i16 signext)
63 declare dso_local signext i16 @getlong()
65 ; Function Attrs: nounwind readnone speculatable willreturn
66 declare void @llvm.dbg.value(metadata, metadata, metadata)
69 !llvm.module.flags = !{!3, !4, !5}
72 !0 = distinct !DICompileUnit(language: DW_LANG_C99, file: !1, producer: "clang version 12.0.0 (git@github.com:llvm/llvm-project 79a35789efdf2378f97642ae4a5f3099b9087a11)", isOptimized: false, runtimeVersion: 0, emissionKind: FullDebug, enums: !2, splitDebugInlining: false, nameTableKind: None)
73 !1 = !DIFile(filename: "test.c", directory: "/fast/fs/llvm3/llvm/test/DebugInfo/MIR/InstrRef")
75 !3 = !{i32 7, !"Dwarf Version", i32 4}
76 !4 = !{i32 2, !"Debug Info Version", i32 3}
77 !5 = !{i32 1, !"wchar_size", i32 4}
78 !6 = !{!"clang version 12.0.0 (git@github.com:llvm/llvm-project 79a35789efdf2378f97642ae4a5f3099b9087a11)"}
79 !7 = distinct !DISubprogram(name: "foo", scope: !1, file: !1, line: 3, type: !8, scopeLine: 3, flags: DIFlagPrototyped, spFlags: DISPFlagDefinition, unit: !0, retainedNodes: !2)
80 !8 = !DISubroutineType(types: !9)
82 !10 = !DIBasicType(name: "int", size: 32, encoding: DW_ATE_signed)
83 !11 = !DIBasicType(name: "short", size: 16, encoding: DW_ATE_signed)
84 !12 = !DILocalVariable(name: "bar", arg: 1, scope: !7, file: !1, line: 3, type: !11)
85 !13 = !DILocation(line: 0, scope: !7)
86 !14 = !DILocalVariable(name: "baz", arg: 2, scope: !7, file: !1, line: 3, type: !11)
87 !15 = distinct !DILexicalBlock(scope: !7, file: !1, line: 8, column: 7)
93 tracksRegLiveness: true
96 - { reg: '$edi', virtual-reg: '%3' }
97 - { reg: '$esi', virtual-reg: '%4' }
102 machineFunctionInfo: {}
109 %6:gr16 = COPY %4.sub_16bit
110 %5:gr16 = COPY %3.sub_16bit
111 ADJCALLSTACKDOWN64 0, 0, 0, implicit-def $rsp, implicit-def $eflags, implicit-def $ssp, implicit $rsp, implicit $ssp, debug-location !13
112 %15:gr32 = MOVSX32rr16 %5, debug-location !13
113 $edi = COPY %15, debug-location !13
114 CALL64pcrel32 @ext, csr_64, implicit $rsp, implicit $ssp, implicit $edi, debug-location !13
115 ADJCALLSTACKUP64 0, 0, implicit-def $rsp, implicit-def $eflags, implicit-def $ssp, implicit $rsp, implicit $ssp, debug-location !13
116 %14:gr32 = MOVSX32rr16 %5, debug-location !13
117 %13:gr32 = ADD32ri8 killed %14, 12, implicit-def $eflags, debug-location !13
118 %11:gr16 = COPY killed %13.sub_16bit, debug-location !13
119 ADJCALLSTACKDOWN64 0, 0, 0, implicit-def $rsp, implicit-def $eflags, implicit-def $ssp, implicit $rsp, implicit $ssp, debug-location !13
120 %9:gr32 = MOVSX32rr16 %11, debug-location !13
121 $edi = COPY %9, debug-location !13
122 CALL64pcrel32 @ext, csr_64, implicit $rsp, implicit $ssp, implicit $edi, debug-location !13
123 ADJCALLSTACKUP64 0, 0, implicit-def $rsp, implicit-def $eflags, implicit-def $ssp, implicit $rsp, implicit $ssp, debug-location !13
124 ADJCALLSTACKDOWN64 0, 0, 0, implicit-def $rsp, implicit-def $eflags, implicit-def $ssp, implicit $rsp, implicit $ssp, debug-location !13
125 CALL64pcrel32 @getlong, csr_64, implicit $rsp, implicit $ssp, implicit-def $ax, debug-location !13
126 ADJCALLSTACKUP64 0, 0, implicit-def $rsp, implicit-def $eflags, implicit-def $ssp, implicit $rsp, implicit $ssp, debug-location !13
127 %8:gr16 = COPY $ax, debug-location !13
128 CMP16ri8 %8, 0, implicit-def $eflags, debug-location !13
129 JCC_1 %bb.2, 4, implicit $eflags, debug-location !13
131 ; DOESCOALESCE-LABEL: bb.1.if.then:
132 ; CHECK-LABEL: bb.1.if.then:
134 %20:gr32 = MOVSX32rr16 %11, debug-location !13
135 %19:gr32 = ADD32ri8 killed %20, 1, implicit-def $eflags, debug-location !13
136 %17:gr16 = COPY killed %19.sub_16bit, debug-location !13
138 ; Verify that vreg 17 is coalesced into a gr32, and not copied any further.
139 ; DOESCOALESCE: %{{[0-9]+}}:gr32 = ADD32ri8
140 ; DOESCOALESCE-NOT: COPY
141 ; Verify those registers land in $bx
142 ; CHECK: renamable $ebp = ADD32ri8
144 ; DOESCOALESCE-LABEL: bb.2.if.end:
145 ; CHECK-LABEL: bb.2.if.end:
147 %2:gr16 = PHI %11, %bb.0, %17, %bb.1, debug-instr-number 1, debug-location !13
148 ; CHECK: DBG_PHI $bp, 1
149 DBG_INSTR_REF !12, !DIExpression(DW_OP_LLVM_arg, 0), dbg-instr-ref(1, 0), debug-location !13
150 %31:gr32 = MOVSX32rr16 %6, debug-location !13
151 %30:gr32 = MOVSX32rr16 killed %2, debug-location !13
152 %29:gr32 = ADD32rr killed %30, killed %31, implicit-def $eflags, debug-location !13
153 %26:gr16 = COPY killed %29.sub_16bit, debug-location !13
154 ADJCALLSTACKDOWN64 0, 0, 0, implicit-def $rsp, implicit-def $eflags, implicit-def $ssp, implicit $rsp, implicit $ssp, debug-location !13
155 %24:gr32 = MOVSX32rr16 %26, debug-location !13
156 $edi = COPY %24, debug-location !13
157 CALL64pcrel32 @ext, csr_64, implicit $rsp, implicit $ssp, implicit $edi, debug-location !13
158 ADJCALLSTACKUP64 0, 0, implicit-def $rsp, implicit-def $eflags, implicit-def $ssp, implicit $rsp, implicit $ssp, debug-location !13
159 %23:gr32 = MOVSX32rr16 %26, debug-location !13
160 $eax = COPY %23, debug-location !13
161 RET64 implicit $eax, debug-location !13